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Báo cáo khoa học: "Root biomass and biomass increment in a beech (Fagus sylvatica L.) stand in North-East France."

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Root biomass and biomass increment in a beech (Fagus sylvatica L.) stand in North-East France. | Ann. For. Sci. 58 2001 1-13 INRA EDP Sciences 2001 1 Original article Root biomass and biomass increment in a beech Fagus sylvatica L. stand in North-East France Noel Le Goff and Jean-Marc Ottorini UMR INRA-ENGREF Ressources Forêt-Bois Équipe Croissance et production 54280 Champenoux France Received 19 November 1999 accepted 13 June 2000 Abstract - This study is part of a larger project aimed at quantifying the biomass and biomass increment of an experimental beech stand aged 30 years and comparing the carbon sequestration in trees to carbon fluxes. The below ground part of trees is expected to play an important role in carbon sequestration. A method has been developed to estimate the biomass and biomass increment of coarse small and fine roots of trees from root system excavations of sampled trees of different crown classes. The biomass and biomass increment of broken root ends during excavation was estimated from the diameter of the roots at the broken points. Equations were then established relating the biomass and biomass increment of the different root categories to tree DBH. These equations were then used to estimate the root biomass and biomass increment of the experimental stand from stem inventory for the different root categories. Trees from dominant and codominant crown classes contribute for more than 80 to below ground biomass and biomass increment of the stand. root system biomass biomass increment biomass distribution Fagus sylvatica Résumé - Biomasse et accroissement en biomasse du système racinaire dans un peuplement de hêtre du Nord-Est de la France. Cette étude fait partie d un projet plus vaste ayant pour objectif l estimation de la biomasse aérienne et souterraine d un peu-plement expérimental de hêtre de 30 ans et de son accroissement pour comparer la quantité de carbone séquestrée annuellement dans les arbres aux flux de carbone mesurés par les échanges gazeux. La partie souterraine des arbres paraĩt jouer un rôle important dans la .